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ML18HP230NEXH-O

ML18HP230NEXH-O is in the certified data.

Its certified full-speed heating output at 5°F is 17,000–18,000 Btu/h, 88–103% of its 47°F rating (tests at different compressor speeds), depending on the pairing.

Mainline · mini-split heat pump

ML18HP230NEXH-O is in the certified data as of Sep 19, 2026. ML18HP230NEXH-O changed its certified heat output at 17°F on AHRI certificate 217607254 from 14,400 Btu/h to 16,600 Btu/h in the certified data between August 2025 and September 2026.

16 certified pairings with 8 different figures. See all

Heating at 47°F

17,000

14,200 at 17°F

17,500 at 5°F

Btu/h, certified

1.95 COP at 5°F

Cooling at 95°F

16,000

Btu/h, certified

EER2 12.5 at 95°F

SEER2 20.0

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for ML18HP230NEXH-O, by outdoor temperature Heating: 17,500 Btu/h at 5°F, 14,200 Btu/h at 17°F, 17,000 Btu/h at 47°F. Cooling: 16,000 Btu/h at 95°F. The bars start at zero. Median of 1.5-ton mini-split models: 14,200 Btu/h at 5°F, 14,800 Btu/h at 17°F, 18,000 Btu/h at 47°F, 18,000 Btu/h at 95°F. 0 5,000 10,000 15,000 20,000 Btu/h 17,500 5°F 14,200 17°F 17,000 47°F 16,000 95°F Outdoor temperature (°F)
  • Heating output
  • Cooling output
  • Median of 1.5-ton mini-split models
  • Example heating load
  • Example cooling load
  • Frosting range, 17 to 45°F

This pairing delivers 17,000 Btu/h of heat at 47°F, 14,200 Btu/h at 17°F, and 17,500 Btu/h at 5°F, 103% of its 47°F rating. It delivers 16,000 Btu/h of cooling at 95°F. At 5°F that is 3,500 Btu/h above the example heating load of 14,000 Btu/h; at 95°F it is 9,000 Btu/h above the example cooling load of 7,000 Btu/h.

Each bar is a separate certified test, drawn at its outdoor temperature, starting at zero. The 47°F figure is at normal speed; the 17 and 5°F figures are at full speed. The short dark line on each bar is the median of 1.5-ton mini-split models, one value per model. The shaded 17 to 45°F band is the frosting range: the outdoor coil can frost, and the unit pauses to defrost.

The dashed lines are example loads for a typical area of about 600 sq ft where winters reach 5°F: heating runs from 14,000 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 7,000 Btu/h at 95°F, at 1,000 sq ft per ton. A house in a hot climate or with large west-facing windows can need twice as much cooling. They are examples, not your building.

Calculate heating and cooling for your house

AHRI certificate 215864383 · listed by MAINLINE · certified Aug 11, 2026 · 2 pairings share these values

All rebate programs and their published thresholds

Certified output and power use

Certified output for the selected pairingThe four bars share one scale. The comparison is with the median of 1.5-ton mini-split models. Heating tests run at 70°F indoors. The cooling test runs at 80°F indoors.
Outdoor temperature Certified outputBtu/h One scale vs class median COPat 5°F
5°Ffull speed 17,5005.13 kW +23% 1.95
17°Ffull speed 14,2004.16 kW −4% NR
47°Fnormal speed 17,0004.98 kW −6% NR
95°Fcooling, full load 16,0004.69 kW — NR

EER2 12.5 in that test. SEER2 20.0 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test
2.63kW
Electrical input in the 95°F cooling test
1.28kW
Seasonal average heating COP
3.02

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 18,000 Btu heat pumps

1.5-ton mini-split models

This pairing at 5°F
17,500 Btu/h
This unit at 5°F median across its pairings
17,500 Btu/h
Median of 1.5-ton mini-split models at 5°F
14,200 Btu/h
Models in this group
1,110

This unit is above 67% of them, at number 369 of 1,110 by heat at 5°F. The middle half of the group runs 13,000 to 18,000 Btu/h.

This size class is defined by cooling capacity, so cooling is not compared here.

Closest models by heat at 5°F

Every 18,000 Btu (1.5-ton) unit, ranked by cooling efficiency, then heating efficiency

Certified values for ML18HP230NEXH-O

16 pairings · 16 AHRI certificates

This pairing is the one shown above. Under all pairings, a single figure means every pairing agrees and a range means the pairing decides.

This pairingAll pairings
Heating
Heat output at 47°F normal speed 17,000 Btu/h 17,000–20,000 Btu/h
Heat output at 17°F full speed 14,200 Btu/h 14,000–16,600 Btu/h
Heat output at 5°F full speed 17,500 Btu/h 17,000–18,000 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 103%
COP at 5°F full speed 1.95 1.86–2.20
HSPF2 Region IV 10.3 10.0–12.3
Cooling
Cooling capacity at 95°F full-load test 16,000 Btu/h 16,000–18,000 Btu/h
EER2 at 95°F 12.5 12.0–13.0
SEER2 cooling season 20.0 18.0–21.7
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-454B
Compressor Variable speed
Indoor unit ML16HP230CON-I 16 indoor units
FurnaceNo furnace None
Cold-climate designation EPA's designation, as published Yes On every pairing
ENERGY STAR Most Efficient EPA's designation, as published Yes On every pairing
Where it is sold US and Canada US and Canada
Model string as certified ML18HP230NEXH-O

Pairings, by indoor-unit class

16 indoor units · 16 certified pairings

One row per indoor unit certified with this outdoor unit.

Air handler · 2 indoor units

  1. ML18HP230AHU-I brand not stated 18,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 19,500 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 92% · COP 2.20

  2. ML18HP230AHU-I* brand not stated 18,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 19,500 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 92% · COP 2.20

Indoor units in the air handler class
Indoor unit Brand At 5°FBtu/h · full speed At 47°FBtu/h · normal speed At 95°FBtu/h · cooling Cold output% of 47°F rating COP 5°Ffull speed Cold climate Pairings
ML18HP230AHU-I — 18,000 19,500 18,000 92% 2.20 Yes 1
ML18HP230AHU-I* — 18,000 19,500 18,000 92% 2.20 Yes 1

Ductless indoor · 14 indoor units

  1. ML16HP230CON-I MAINLINE 17,500 Btu/hat 5°F, full speed

    1 pairing · 47°F 17,000 Btu/h · 95°F cooling 16,000 Btu/h · Cold output 103% · COP 1.95

  2. ML16HP230CON-I* MAINLINE 17,500 Btu/hat 5°F, full speed

    1 pairing · 47°F 17,000 Btu/h · 95°F cooling 16,000 Btu/h · Cold output 103% · COP 1.95

  3. ML18HP2301WYCAS-I MAINLINE 17,500 Btu/hat 5°F, full speed

    1 pairing · 47°F 20,000 Btu/h · 95°F cooling 16,700 Btu/h · Cold output 88% · COP 1.89

  4. ML18HP2301WYCAS-I* MAINLINE 17,500 Btu/hat 5°F, full speed

    1 pairing · 47°F 20,000 Btu/h · 95°F cooling 16,700 Btu/h · Cold output 88% · COP 1.89

  5. ML18HP230FLO-I MAINLINE 17,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 19,000 Btu/h · 95°F cooling 17,000 Btu/h · Cold output 89% · COP 1.86

  6. ML18HP230FLO-I* MAINLINE 17,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 19,000 Btu/h · 95°F cooling 17,000 Btu/h · Cold output 89% · COP 1.86

  7. ML18HP230HSDUC-I MAINLINE 18,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 19,500 Btu/h · 95°F cooling 17,500 Btu/h · Cold output 92% · COP 2.10

  8. ML18HP230HSDUC-I* MAINLINE 18,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 19,500 Btu/h · 95°F cooling 17,500 Btu/h · Cold output 92% · COP 2.10

  9. ML18HP230LSDUC-I MAINLINE 18,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 19,000 Btu/h · 95°F cooling 17,000 Btu/h · Cold output 95% · COP 2.00

  10. ML18HP230LSDUC-I* MAINLINE 18,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 19,000 Btu/h · 95°F cooling 17,000 Btu/h · Cold output 95% · COP 2.00

  11. ML18HP230NEX-I MAINLINE 18,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 18,000 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 100% · COP 2.00

  12. ML18HP230NEX-I* MAINLINE 18,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 18,000 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 100% · COP 2.00

  13. ML18HP230STDCAS-I MAINLINE 17,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 19,000 Btu/h · 95°F cooling 16,000 Btu/h · Cold output 89% · COP 1.90

  14. ML18HP230STDCAS-I* MAINLINE 17,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 19,000 Btu/h · 95°F cooling 16,000 Btu/h · Cold output 89% · COP 1.90

Indoor units in the ductless indoor class
Indoor unit Brand At 5°FBtu/h · full speed At 47°FBtu/h · normal speed At 95°FBtu/h · cooling Cold output% of 47°F rating COP 5°Ffull speed Cold climate Pairings
ML16HP230CON-I MAINLINE 17,500 17,000 16,000 103% 1.95 Yes 1
ML16HP230CON-I* MAINLINE 17,500 17,000 16,000 103% 1.95 Yes 1
ML18HP2301WYCAS-I MAINLINE 17,500 20,000 16,700 88% 1.89 Yes 1
ML18HP2301WYCAS-I* MAINLINE 17,500 20,000 16,700 88% 1.89 Yes 1
ML18HP230FLO-I MAINLINE 17,000 19,000 17,000 89% 1.86 Yes 1
ML18HP230FLO-I* MAINLINE 17,000 19,000 17,000 89% 1.86 Yes 1
ML18HP230HSDUC-I MAINLINE 18,000 19,500 17,500 92% 2.10 Yes 1
ML18HP230HSDUC-I* MAINLINE 18,000 19,500 17,500 92% 2.10 Yes 1
ML18HP230LSDUC-I MAINLINE 18,000 19,000 17,000 95% 2.00 Yes 1
ML18HP230LSDUC-I* MAINLINE 18,000 19,000 17,000 95% 2.00 Yes 1
ML18HP230NEX-I MAINLINE 18,000 18,000 18,000 100% 2.00 Yes 1
ML18HP230NEX-I* MAINLINE 18,000 18,000 18,000 100% 2.00 Yes 1
ML18HP230STDCAS-I MAINLINE 17,000 19,000 16,000 89% 1.90 Yes 1
ML18HP230STDCAS-I* MAINLINE 17,000 19,000 16,000 89% 1.90 Yes 1

The share is heat output at 5°F divided by the 47°F rating.

Showing 16 of 16 indoor units

Sold as, and units with identical certified values

Brands listing this model number

Model number as listed

  • ML18HP230NEXH-O 16 pairings

Variants of the same model number

5 units in this group. Basis: identical certified values in the certified data. This grouping is our inference, not a field in the certified data.

4 of 5 shown.

What affects the price

We don't have prices. These things drive the cost.

  • The size of the unit, and the indoor equipment on the same certificate.
  • Whether existing ductwork is reused, altered, or replaced.
  • The electrical work: a circuit, a disconnect, and sometimes a panel change.
  • Refrigerant line length and how the outdoor unit is mounted.
  • Permits and inspection, which vary by municipality.
  • Removing and disposing of the old equipment.
  • Local labor rates and how busy the season is.
  • Rebates and tax credits, which change and have deadlines.

Product history

  • ML18HP230NEXH-O changed its certified heat output at 17°F on AHRI certificate 217607254 from 14,400 Btu/h to 16,600 Btu/h in the certified data between August 2025 and September 2026.
  • ML18HP230NEXH-O first appeared in the certified data between June 2025 and August 2025.

History and definitions

History

First certified record
Most recent certified record
Measurements reported
Aug 11, 2026
Status
In the certified data

Field definitions

COP
Heat delivered for each unit of electricity used. A COP of 2.5 gives 2.5 times the heat of an electric baseboard heater.
HSPF2
Heating efficiency over a typical season. Higher uses less electricity.
SEER2
Cooling efficiency over a typical season. Higher uses less electricity.
EER2
Cooling output divided by electrical input in the 95°F full-load test, in Btu/h per watt.
Cold output
Heat output at 5°F as a percentage of the 47°F rating.
% of rating at 17°F
Heat output at 17°F as a percentage of the 47°F rating.

NR not in the certified dataNC not cold-climate certifiedSP single pairing onlyVP varies by pairing; see the pairings tableWD withdrawn since the certified data was last read

Cite or print this page

Heat Pump List, “ML18HP230NEXH-O — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/ml18hp230nexh-o